If you agree to take part in this study, you will be asked questions about your physical activity to make sure you are eligible. If you are found to have any pre-existing medical or dietary conditions that may prevent you from participating in this study, you will be asked to have your physician complete a form about your health conditions. You will only be allowed to participate in this study if he or she feels it is safe for you to engage in moderate physical activity. After physician clearance, if applicable, you will be scheduled for study visits at the Behavioral Research and Treatment Center (BRTC) at MD Anderson where you will complete tasks to measure your physical functioning ability. Information about your cancer and treatment history will be collected from your medical records as part of this study.